I know a dude who may want to part with his if you want me to ask. No it’s not stolen, he is a former member of the Air Force honorably discharged.
Unless you plan on doing any actual hunting with it (deer, hog, etc.) get a .22M4 platform. Ammo is cheaper (especially in bulk), it will still kill if you need it to, and it's a lot cheaper to shoot. Of course you probably already know this, but if you do get an AR15, only buy one stamped 5.56, do not buy a rifle stamped .223.